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Additional
barn (unit)
English Wikipedia - The Free Encyclopedia
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Barn (unit)
A
barn
(symbol
b
) is a unit of
area
. Originally used in
nuclear physics
for expressing the
cross sectional
area of
nuclei
and
nuclear reactions
, today it is also used in all fields of
high-energy physics
to express the cross sections of any
scattering process
, and is best understood as a measure of the probability of interaction between small particles. A barn is defined as 10
-28
m
2
(100
fm
2
) and is approximately the cross-sectional area of a
uranium
nucleus. The barn is also the unit of area used in
nuclear quadrupole resonance
and
nuclear magnetic resonance
to quantify the interaction of a nucleus with an
electric field gradient
. While the barn is not an
SI
unit, the SI standards body accepts its use with SI units due to its continued use in
particle physics
.
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